[Arm-netbook] rs232 level shifters

[mike.valk at gmail.com]

2013/11/16 luke.leighton <luke.leighton at gmail.com>

> On Sat, Nov 16, 2013 at 8:22 PM, Henrik Nordström
> <henrik at henriknordstrom.net> wrote:
> > lör 2013-11-16 klockan 13:23 +0000 skrev luke.leighton:
> >> https://www.sparkfun.com/tutorials/215
> >>
> >> in the end i went with this for the router, using an IMD2A for the two
> >> transistors.
> >
> > Personally I haven't used RS232 in ages, only different "TTL" serial
> > variants of 5V or 3.3V.
>
>  yehh i have to be reaasonably compatible with RS232, as this is
> actually going to have a 9-pin header on it.  although the only thing
> it will be connected to in most cases is one of those... yup, USB
> serial converters.
>

Why don't we include a USB to TTL-Serial chip on the card and/or carrier.
Just like Solid_run did/does with their CuBoxes.

Pro's:
- nobody need to have a RS-232 or TTL dongle.
- we can tune the usb-ttl chip to the SoC/MicroController
- No fiddeling with voltage levels outside the both
- USB-Interface are everyware
- USB has standardized cables
- USB ports are fixed. Doesn't get lost in the rubble.
- Amateur developers aren't required to invest in additional hardware to
get started or helpout.

Con's
- Extra space needed
- Extra chips / costs
- USB-TTL chips sometimes require drivers to operate.

http://www.solid-run.com/mw/index.php/Serial_console



>
>  l.
>
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